Throw the right exception on a malformed status line

[swankjesse]

This test currently fails:

public void testMalformedStatusLine() throws IOException {
    server.enqueue(new MockResponse().setStatus("HTP/1.1 200 OK"));
    server.play();

    OkHttpConnection urlConnection = OkHttpConnection.open(server.getUrl("/"));
    try {
        urlConnection.getResponseCode();
        fail();
    } catch (IOException expected) {
    }
}

[swankjesse]

Fixed. #43